You can view a timeline of the hearing by following the link below.
Some of the highlights include:
"It seems to be that, if border security is to be measured by an amorphous, multi-factored, subjective test, that this committee knows to a metaphysical certainty, that DHS will conclude that border security is satisfied... and if a trigger is certain to occur, then I would suggest that it is not a meaningful trigger that is measuring anything. Let me ask you this: can you describe a circumstance in which the evidence would be such that DHS would say that the trigger is not satisfied, that border security is not there? You've already told us that apprehensions are at the lowest level in 40 years, and yet the border is secure. So what would the facts have to be for DHS to conclude the triggers are not satisfied?"